I was playing normally in my world, just makin ("off camera") some villagers breed, and making some new houses, as it was just a ton of babies... somehow.
Then while building the spruce house, wich was with block contact with the birch one, i noticed i was slippering arround like i would do in an ICE.
This also got glitchy when i was in 1.16.0, fixed in the newer version, and back to the bugs.
The villagers are that way since 1.14.50 (bedrock), sooo.
Yeah, how to reproduce:
1. Grab some stairs and/or slabs.
2. Try walking in it, you will see it's kinda slippery (creative mode).
3. If it don't work, try shift walking in it,